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Negative electrode for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, battery electrodes, etc., can solve problems such as large volume expansion, and achieve the effect of suppressing the reduction of discharge capacity and improving high-temperature charging and storage characteristics.

Active Publication Date: 2015-03-25
PANASONIC ENERGY CO LTD MORIGUCHI SHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of using this material, although the specific capacity is very high compared with graphite, the volume expansion is large, and there are problems that should be solved in terms of safety.

Method used

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  • Negative electrode for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery
  • Negative electrode for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] A battery was produced in the same manner as in the above-mentioned embodiment.

[0033] The thus fabricated battery is hereinafter referred to as battery A1.

Embodiment 2

[0035] In SiO x A battery was produced in the same manner as in Example 1 above, except that the ratio of HMDI dissolved in DEC was 5% by mass during the surface treatment. It should be noted that all reactions of the above-mentioned HMDI were confirmed by gas chromatography. This is also the same in Examples 3 to 6 described later. In addition, compared to SiO x The coating ratio was 6 mol%.

[0036] The thus fabricated battery is hereinafter referred to as battery A2.

Embodiment 3

[0038] In SiO x A battery was produced in the same manner as in Example 1 above, except that the ratio of HMDI dissolved in DEC was 10% by mass during the surface treatment. It should be noted that, compared to SiO x The ratio of the coating film was 12 mol%.

[0039] The thus fabricated battery is hereinafter referred to as battery A3.

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Abstract

The purpose of the present invention is to provide a nonaqueous electrolyte secondary battery which has achieved dramatically improved battery characteristics by suppressing decrease in the discharge capacity during initial cycles and improving the high-temperature charging storage characteristics. This negative electrode for nonaqueous electrolyte secondary batteries is provided with: a negative electrode mixture layer that comprises a negative electrode active material containing SiOx (wherein x is more than or equal to 0.8 and less than or equal to 1.2) and graphite; and a negative electrode collector, on at least one surface of which the negative electrode mixture layer is formed. A coating film that is derived from a compound having an isocyanate group is formed on the surface of the SiOx.

Description

technical field [0001] The present invention relates to a negative electrode for a nonaqueous electrolyte secondary battery, a method for producing the same, and a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, the miniaturization and weight reduction of mobile information terminals such as mobile phones, notebook PCs, and smartphones has rapidly progressed, and further increases in capacity have been demanded for batteries as their driving power sources. Non-aqueous electrolyte secondary batteries, which are charged and discharged by moving lithium ions between the positive and negative electrodes along with charging and discharging, have high energy density and high capacity, and are therefore widely used as driving power sources for the above-mentioned mobile information terminals. [0003] The above-mentioned mobile information terminal tends to consume more power as functions such as moving image reproduction and game functions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/36H01M4/48H01M10/052H01M10/0566H01M4/587
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/366H01M4/48H01M10/052H01M4/364H01M4/485H01M4/587H01M4/62H01M10/0525Y02E60/10H01M4/583H01M4/60H01M2220/30
Inventor 野村峻山本泰右山本英和贝塚笃史井町直希
Owner PANASONIC ENERGY CO LTD MORIGUCHI SHI
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